Two powder Nd2Fe14B magnets with DyGa addition
作者： C. H. de Groot , K. H. J. Buschow , F. R. de Boer , Kees de Kort
DOI: 10.1063/1.366734
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摘要: Magnetic and structural properties of sintered NdFeB magnets with addition various amounts DyGa as a separate powder are studied compared single-powder the same nominal composition. When annealed above 640 °C, coercivity decreases strongly to below 640 °C. Decomposition δ phase (Nd6Fe14−xGax) accompanies this drop. Measurements function temperature show that decomposition does not increase effective demagnetization factor, but enlarges either magnetic inhomogeneous region at grain surface or exchange coupling between grains. Line faults, which present within Nd2Fe14B grains when magnet is do act pinning centers. Phase analysis diffusion profiles Dy Ga concentration made using electron probe micro-analysis. This shows forms Nd3Ga2 Nd6Fe12.7Ga1.3 intergranular phases. Its co...
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